Mechanical stoker.



wmm.

F. M. CLARK.

MECHANICAL STOKER.

APPLICATION FILED APR. 14. I914.

Patented J an. 11, 191-6.

3 SHEETS-SHEET I.

IIVVENTOI? BY mm AT OR/VEV COLUMBIA PLANOORAPH CO-IWAM'IINGTON, D.

F. M. CLARK. MECHANICAL STOKER. APPLICATION FILED APR. I4. 1914.

1,167,627, Patented Jan. 11, 1916.

3 SHEETS-SHEET 2.

WITNESSES.

INVENTOR Arm/my COLUMBIA PLANOGRAPH C0-,\VASHINGTON. u. c.

'F. M. CLARK.

MECHANICAL STOKER. APPLICATION FILED APR. 14. 1914.

1,161.62? Patented Jan. 11, 1916.

3 SHEETS-SHEET 3.

SAWMMMy tiara-ran snares PATENT onnibn FRANCIS MORTON CLARK, OF GARDEN CITY, NEW YORK.

MECHANICAL STOKER.

Application filed April 14, 1914.

To all whom it may concern:

Be it known that I, FRANCIS Mon'ron CLARK, a citizen of the United States, and a resident of Garden City, in the county of Nassau and State of New York, have invented a certain new and useful Improvement in Mechanical Stokers, of which the following is a full, clear, and exact description.

My invention is an improvement in mechanical stokers and its principal objects are the provision of a stoker of the chain grate type in which the grate bars may have a limited movement with relation to the conveyer chains (which latter may always be maintained in taut condition) and the fur nishing of novel and eiiicient means for moving the grate bars relatively to one another at certain points in their travel to aid in preventing the formation of clinker or large masses of comparatively impervious coke and to break up such masses'if already formed.

Further and more detailed objects and advantages of my invention will later appear in the specification and be pointed out in the appended claim.

In the three sheets of drawings accompanying this application and forming a part hereof Figure 1 is a partial vertical section of a furnace, boiler, and a stoker embodying my invention, certain of the parts appearing in side elevation; Fig. 2 is a .perspective view of an agitator bar employed to give the relative movement to the grate bars, a portion of the retaining strut for said agitator bar being also shown; Fig. 3 is a side view of one form of grate bar section which may be employed in my invention; Fig. 1 is a side view of a series of grate bar sections assembled to form a grate bar, the sections illustrated having difierent points of contact for the agitator bar from that shown in Fig. 8; Figs. 5 and 6 show still other modified forms of 'rate bar sections; Fig. 7 is a partial side view of one of the idler shafts of the stoker showing the agitator bar in vertical section and means for preventing lateral displacement of the agitator bar; Fig. 8' is an end view on a larger scale of a portion of the chain grate,

Specification of Letters Patent.

ing means may be employed.

Patented J an. 131, 191%.

Serial No. 831,783.

grate in Fig. 1 and have omitted the details of the actuating mechanism therefor, as these'details form no part of the present invention and any well known type of actuat- The grate is of the endless chaln type, in which conveyer chains 13 are employed and the grate bars which are carried by these chains extend transversely across the furnace. These grate bars maybe a unit but I prefer to n ake them in sections joined end to end, as illustrated in Fig. 4. In the preferred form shown in the drawings the chains 13 are formed of links 14 (see Fig. 9) which are provided on one side with a hook 15 and on the opposite side with an eye 16 by means of which they are connected into an endless chain. Transversely of each link 14 there is provided a socket 17 having slightly flaring vertical walls, which socket is for the reception of the correspondingly tapering webs of the grate bar sections, and holes 18 through the vertical Walls of the sockets are provided for receiving attaching means to hold the grate barsections in place.

Modified forms of grate bar sections are shown in various figures of the drawings but all are attached to the chains in the same manner. A pair of vertically elongated openings 19, 20 are provided near each end of each section, the distance of the openings 19 from the end of the section being slightly less (to allow for irregularities in fitting) than half the distance between the open ings 19 and 20 and the latter being equal to the distancebetween the holes 18 in the link 14. If the section is to be attached to an outside conveyer chain the section is placed so that the cotter pins 21 secure the section by passing through the openings 19 and 20 and the pair of holes 18. On the other hand if the attachment is to be made to an intermediate chain, the respective sections only part way enter the sockets 17 and a single cotter pin passing through the openings 19 attaches the section.

As previously stated, the openings 19, 20 are elongated in a vertical direction, this being for the purpose of allowing the sections a limited vertical movement with respect to the chains, the movement being for the purpose of preventing or breakin up clinker and masses of coke and thus affording thorough aeration of the fire. For the purpose of giving this vertical movement to the grate bar sections I provide underneath each section one or more agitator bars 22, shown in position in Fig. 1 and in enlarged view in Fig. 2. These bars, which I show as made in inverted V-shape in cross section for convenience in making by casting, are supported by the idler shafts 23 and are held in place against longitudinal displace- I ment by a bolt 24 passing through the strut 25 which extends from one side of the frame to the other. The bolt 24 is threaded as shown and a nut 26 engaging the front side of the strut 25 forms a means of adjusting the agitator bar in a lengthwise direction. The lower surface of the agitator bars is provided with inclined portions 27 adjacent the points of support on the shafts 23 so that by tightening the nuts 26 and drawing the agitator bars toward the front of the furnace the bars will be elevatedthus providing a convenient means of adjusting the height of the bars or taking up any wear which may result to their upper faces.

The upper side of the agitator bars is preferably flattened as shown and is provided with a series of inclines 28 which are in position to engage the under side of a grate bar section and raise it w1th respect to the preceding and following sections. A single agitating bar may be provided for each section engaging it at its middle, as provided for in the modifications of Figs. 3 and 6; or a pair may be provided for each section, as indicated in Figs. 4: and 5, 1f a tendency to tilt is observed.

In Figs. 3 and 4: the agitator bars will engage at the points 29 and 30 respectively and at these points there may or may not be provided any special lugs for engaging the agitator bars, the mere engagement of the webs of the sections being sufficient. These points of engagement being below the axis of attachment of the sections to the chains, there will be a tendency for the section not only to rise but also to tilt toward the rear of the furnace as indicated by section Z in Fig. 9.

In the modifications of Figs. 5 and 6 cut out portions 31, or 32 are provided (depending on whether the section is to have one or two agitator bars). These cut out portions provide engaging surfaces for the agitator bars above'the axis of support of the sections and therefore there is no tendency for the sections to tilt around their longitudinal axes.

In Fig. 7 I have illustrated a collar 33, held in position by a set screw 34, which may be placed on the shafts 23 as shown to hold the agitator against lateral displacement. This feature may be employed with advantage with the modifications of Figs. 3 and 4; though I do not limit myself to its use. 7

As will be evident from Fig 2 the spacing of the inclines 28 need not be uniform throughout the length of the agitator but these inclines may be spaced according to the need for them, more or less being employed according as it is found necessary or advisable. I have also illustrated the agitator as beginning under the rear side of the arch and as extending only part way to the rear of the furnace. I do not wish to limit myself, however, to any particular place for starting Or stopping the agitation but may proportion or place the agitators at will as may be found necessary or desirable in treating difierent kinds of fuel.

The operation of my device will be evident from the above detailed description. The grate bars in their progress toward the rear of the furnace will ride over the inclines 28 and, on account of the freedom given thereto by the elongated openings 19, 20, will be displaced vertically with reference to the conveyer chains and the'adjacent grate bars, as indicated at X, Y, in Fig. 1. The action of the device when employed with a grate bar section having its point of contact with the agitator bar below the axis of support of the section is more clearly illustrated in the larger scale drawing of Fig. 8. As will be seen the bar is tilted toward the rear of the furnace and this action aids in,clearing the teeth of the respective sections while not tilting the bars far enough to permit fuel falling through.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

In a mechanical stoker, conveyer chains, a plurality of grate bars mounted directly on said chains, said grate bars having vertically slotted connection with said chains, an agitator bar having inclined planes on its upper surface disposed in the path of the lower portion of said grate bars and inclined planes on its lower surface, transverse shafts supporting said agitator bar and located in cooperative relation to said last mentioned planes, and means for imafiixed my signature in the presence of two pafting noveinelnt to said figitgtor 105ml in Witnesses. a on ltu ina irection W ere sai ast menti%ned inclines will ride on Zaiol shafts FRANCIS MORTON CLARK 5 and thereby adjust the vertical position of Witnesses:

the agitator bar. N. I. MORTON,

In testimony whereof, I have hereunto J. MITCHELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

